Allied H12E, Service Manual

Page: 15 / 121

Section 1
1 - 7
Operation & Control
There are two types of internal operation option codes:
Internal Operation Option Code B and Code D (see
Figures 1-9 and 1-10).
To operate the winch, the tractor must be running, and
the tractor work equipment lever must be in the unlocked
position.
LINE-IN , LINE-OUT, and BRAKE-ON are
controlled by a proportional control lever. When the control
lever is in the
BRAKE-ON or centered position, the holding
brake is automatically applied. Pushing the lever away
from the operator releases the brake and reels wire rope
off the drum (
LINE-OUT ). Pulling the lever towards the
operator releases the brake and reels wire rope onto the
drum (
LINE-IN ). Releasing the lever causes it to return to
the BRAKE-ON position, which stops the drum rotation
and applies the holding brake. Moving the lever a small
amount results in slow wire rope movement for inching
control. Line speed increases proportionally as the lever
is moved farther.
BRAKE-OFF is controlled by a switch located on the
operator console and directs hydraulic pressure to release
the brake-off clutch.
BRAKE-OFF is used when there is a load attached to the
winch wire rope and the operator wants to move the tractor
away from the load with wire rope spooling off the drum in
a controlled manner.
In BRAKE-OFF , hydraulic pressure is applied to release
the brake-off clutch. As wire rope is pulled from the winch,
the turning drum back-drives the winch gear train to the
brake-off clutch. The winch motor, brake, and planetary
reducer remain stationary. Mechanical drag through the
gear train and viscous drag in the brake-off clutch keep the
wire rope from bird-nesting as it is spooled off the drum.
BRAKE-OFF should not be used to lower
a suspended load or a load that can slide
down a slope.
Winches with option Code D have a HI-SPEED switch to
override automatic motor displacement control.
Figure 1-9 Control Levers & Switch
(Option Code B)
Figure 1-10 Control Levers & Switch
(Option Code D)
• Internal Option Code B
Operation of the winch is controlled by a control lever,
and a
BRAKE-OFF switch at the tractor’s control station.
• Internal Option Code D
Operation of the winch is controlled by a control lever, a
BRAKE-OFF switch and a HI-SPEED switch at the trac-
tor’s control station.